I think the difference is that your faith is "magisterial" and based firmly on official statements. Outside of magisterial definition and teaching doctrinal things are not so clear-cut. Over the past millennium you have been quite busy defining more and more of your faith by magisterial definition. There is probably not much left now to officially define.
Good thing, I'm exhausted.
Yes, with all the definitions over and done with you are probably approaching the state of theological stagnation so feared by Scott Hahn.
I guess you could always consider removing a few more books from the Catholic Bible, just to keep the development going?